Hair brush



FIG. 1 is a front view of a hair brush.

FIG. 2 is a left side view thereof.

FIG. 3 is a back view thereof.

FIG. 4 is an isometric view thereof.

FIG. 5 is a top view thereof; and,

FIG. 6 is bottom view thereof.

The broken lines depict portions of the article that form no part of the claimed design. 

CLAIM The ornamental design for a hair brush, as shown and described. 